Abstract: The present invention relates to an electro-hydrostatic system (1) with a hydraulic machine (11) which is driven by an electric motor (10) and has a variable volume and/or rotational speed for providing a volumetric flow rate of a hydraulic fluid, a differential cylinder (20) with a piston surface and with an annular surface, and at least one equalization container (30, 37), wherein the drive system (1) has a closed hydraulic circuit and during operation has an overpressure relative to the environment by means of the hydraulic machine (11) and/or a pretensioning source (15, 37), and the drive system (1) provides a movement of the cylinder in a first direction by means of a volumetric flow rate of the hydraulic machine (11) and a volumetric flow rate from the equalization container (30, 37), and provides a movement in a second direction by means of a volumetric flow rate of the hydraulic machine (11) and a volumetric flow rate into the equalization container (30, 37), and a power operating mode and a speed ope

Abstract: A control valve has a first and second pilot chambers facing both ends of a spool, a signal pressure passage configured to lead a pilot pressure of the first and second pilot chambers to another device other than the control valve as a signal pressure, a communication groove configured to allow the first pilot chamber and the signal pressure passage to communicate with each other, a communication hole configured to allow the second pilot chamber and the signal pressure passage to communicate with each other, and a check valve interposed in the communication hole, and the check valve has a poppet portion configured to open or close the communication hole and a spacer portion configured to regulate a moving amount of the poppet portion in an open direction, and the control valve further includes a movement regulating portion configured to regulate movement of the spacer portion toward the poppet portion.

Abstract: A lubricating oil supply apparatus may include a rotational portion that rotates together with a rotational shaft and a fixed portion that maintains a fixed location thereof and supplies oil through a space that circles with respect to a rotational center of the rotational portion, thereby supplying oil regardless of a rotational direction of the rotational shaft.

Abstract: A system uses a two-stage electrohydraulic servo valve that includes an additional control port that commands a fail-fixed valve to lock the position of a device in the last commanded position. The additional port is modulated by an existing land on the EHSV valve element, adding little to no complexity. Major technical benefits of the disclosed system are that it adds little to no cost, complexity, size, or weight the device being controlled. The disclosed configuration allows for the use of a relatively small and simple fail-fixed valve, and the control ports on the controlled device keep “drift” to a minimum, when transitioning between normal operating mode and fail-fixed operating mode.

Abstract: A pot-shaped, cold-formed steel brake piston as a pot which is open on one side includes a base and a wall including inner and outer walls, a radially inwardly configured groove is open in a radially outward direction and forms, radially at the inside, a groove bead projection. The open side of the pot ends as a bearing for a friction pad backplate. Interfaces integrated at the inside on the end side serve a) for the fixing between friction pad and steel brake piston and b) as support bearing for spring mounting the friction pad. An aspect is a further improved steel brake piston of the new generation. The minimum inner diameter dimin is axially set back in the direction of the base by a multiple of the length of a wall thickness s, and the minimum piston inner diameter dimin is formed by the groove bead projection.

Abstract: The present disclosure relates to a hydraulic valve arrangement comprising a first pilot operated proportional directional control valve having a first valve member that is displaceable in a first and a second axial direction for controlling direction of supply and discharge of hydraulic fluid to and from a hydraulic actuator, a first proportional electro-hydraulic control valve for controlling displacement of the first valve member in the first axial direction, a second proportional electro-hydraulic control valve for controlling displacement of the first valve member in the second axial direction, and a second pilot operated proportional control valve having a second valve member configured to be controlled by the first and second proportional electro-hydraulic control valves via a shuttle valve arrangement.

Abstract: A hydraulic system of an industrial vehicle includes an oil tank in which hydraulic oil is retained; a hydraulic pump that draws in the hydraulic oil from the tank and supply the oil to a loading actuator and a brake unit; a brake valve that controls the hydraulic oil to be supplied to the brake unit according to an operation of a brake operation tool; a hydraulic oil cooler that cools the hydraulic oil; a cooling passage that allows the hydraulic oil to flow toward the cooler and further allows the oil cooled in the cooler to flow toward the brake unit; and a switching valve that switches between a first oil passage that cuts off a supply of the hydraulic oil from the hydraulic pump to the cooling passage and a second oil passage that allows the supply of the hydraulic oil from the hydraulic pump to the cooling passage.

Abstract: A piston unit is provided with a piston body; a packing mounted on an outer circumferential portion of the piston body; a holding member having a plurality of magnet holding portions that are arranged along a circumferential direction; a plurality of magnets which are held at intervals in the circumferential direction; a first annular yoke disposed on one side in an axial direction of the plurality of magnets; and a second annular yoke disposed on the other side in the axial direction of the plurality of magnets.

Abstract: Even where the differential pressure across a directional control valve associated with each actuator is very small, flow dividing control of the plurality of directional control valves can be performed stable, and even where a demanded flow rate suddenly changes at the time of transition from composite action to single action or the like, a sudden change of the flow rate of hydraulic fluid to be supplied to each actuator is prevented to implement superior combined operability. Further, the meter-in loss of the directional control valves can be reduced to implement a high energy efficiency.

Abstract: A hydraulic actuator control system that includes an actuator. A pump pumps a hydraulic fluid to move the actuator. A first control valve fluidly couples to the pump. The first control valve provides a first hydraulic fluid flow to the actuator. A maximum first hydraulic fluid flow through the first control valve is less than a maximum required hydraulic fluid flow of the actuator. A second control valve fluidly couples to the pump. The second control valve provides a second hydraulic fluid flow to the actuator. A maximum second hydraulic fluid flow through the second control valve is less than the maximum required hydraulic fluid flow of the actuator. A controller controls the first control valve and the second control valve to provide the hydraulic fluid to the actuator.

Abstract: A switching device for alternately connecting a hydraulic drive of a lubricating pump to a pressure line and to a return line of a hydraulic circuit. The switching device includes first and second drive lines connected to the hydraulic drive, and pressure and return drive lines connected to the pressure and return lines. A switching valve is in fluid communication with the drive lines and is switchable between first and second switching states to connect the pressure drive line to the first drive line or to the second drive line. A plurality of hydraulic control lines control the position of the switching valve. The drive lines are configured to conduct a first volumetric flow of hydraulic fluid and the hydraulic control lines are configured to conduct a second volumetric flow of the hydraulic fluid different than the first volumetric flow.

Abstract: There are disclosed a method and a lifting mechanism for actively damping in mobile working machines vibrations which may occur as a result of raised attachments during travel. The method or the lifting mechanism has a prediction or a predictor for estimating the future vibration. The prediction is preferably carried out with a recursive least squares algorithm. The mobile working machine may, for example, be a tractor.

Abstract: A vacuum motor has a piston that linearly oscillates in the internal space of a housing. A gas outlet and a gas inlet (supplying ambient air) located in the housing terminate in the space between the piston and the housing rear side. The piston never covers the outlet or inlet. A valve body closes the inlet. A pestle moves within the housing between the piston and valve body. When the piston moves toward the rear side of the space, the valve body moves against the force of a spring and opens the inlet. The free cross-section of the opened inlet is at least equal in size to the free cross-section of the outlet. A surgical drive system, a medical lavage system, and a medical device for brushing, rasping or sawing of tissue or bone—all include the vacuum motor. Also disclosed is a method for operating the vacuum motor.

Abstract: A hydraulic system includes a first system discharge fluid tube that discharges fluid flowing through a first supply fluid tube, a second system discharge fluid tube that discharges fluid, a first control valve, and a second control valve connected to a second supply fluid tube, the first system discharge fluid tube, and the second system discharge fluid tube, configured to be switched between: a supply position that supplies fluid from the second supply fluid tube to the first supply fluid tube; a first stop position that stops supply of fluid from the second to the first supply fluid tube and supplies fluid from the first supply fluid tube to the first system discharge fluid tube; and a second stop position that stops supply of fluid from the second to the first supply fluid tube and supplies fluid from the first supply fluid tube to the second system discharge fluid tube.

Abstract: A control apparatus for supplying at least one hydraulic consumer with fluid has a variable displacement pump (10) controlled by a load-sensing pressure (LS). For a case-by-case increase in the volume flow in the supply of fluid (22) to the hydraulic consumer, the load-sensing pressure (LS) is passed via a control line (28) to a control circuit (2) that ensures the increase in the supply (22) by connecting in a constant-displacement pump (16) as soon as an operator calls for the relevant function by operating the control circuit (2).

Abstract: A hydraulic assembly for an extendable lift arm assembly can include an extension cylinder, a leveling cylinder, a main control valve, a flow combiner/divider, and one or more flow-blocking arrangements. The main control valve can be configured to control commanded movement of the extension and leveling cylinders of the lift arm assembly. The flow combiner/divider can be configured to hydraulically link the extension cylinder with the leveling cylinder for synchronized operation of the extension cylinder and the leveling cylinder. The one or more flow-blocking arrangements can be configured to restrict flow from rod or base ends of the leveling or extension cylinders during commanded extension or retraction of the leveling and extension cylinders, or in the absence of commanded movement of the leveling and extension cylinders, to maintain synchronized orientation of the leveling and extension cylinders.

Abstract: This unique and novel exemplary embodiment of a high-volume diaphragm securement apparatus is related to a device for securing high-volume diaphragms that vary in size above the pressure chamber of a high-volume double diaphragm pump. The exemplary embodiment is comprised of a pair of pressure chambers, each providing an enlarged upper wall section, and a pair of corresponding geometrically adaptive retainer plates. Each retainer plate provides the ability to be customized with one or more notches such that they each can be installed on a variety of diaphragm pumps.

Abstract: A control device for an agricultural vehicle having a spray boom assembly for spreading material, such as fertilizer, plant protection products or seeds includes a control unit and at least two pressure control valves used for controlling an inclination of the spray boom assembly and connected to the control unit. Each pressure control valve has assigned thereto a check valve and a pressure sensor, the check valve being arranged between the pressure sensor and the pressure control valve. An agricultural vehicle and a method for operating the agricultural vehicle are arranged to spread material, such as fertilizer, plant protection products or seeds.

Abstract: A torque converter includes a cover, an impeller including an impeller shell connected to the cover, a turbine including a turbine shell and at least one turbine blade fixed to the turbine shell, a seal plate, wherein the seal plate located axially between the cover and the turbine shell, and a pilot hub connected to the seal plate utilizing a spline connection.

Abstract: A remote controlled demolition robot (10) comprising a controller (17) and at least one actuator (12) controlled through a hydraulic system (400) comprising at least one valve (13a) and a hydraulic gas accumulator (440), wherein the controller (17) is configured to determine a fluid flow in the hydraulic system (400), determine if the determined fluid flow in the hydraulic system is above a first threshold, and if so discharge the accumulator (440) to provide power to the actuator (12); and determine if the determined fluid flow in the hydraulic system is below a second threshold, and if so charge the accumulator (440) for buffering power in the hydraulic system (400).